i forgot to say that at 1250 GPU and 2200 MC system is stable...just need to undervolt it, but i do not now how, and how much mV per card?
Use Wattman in Radeon settings. For that card you can drop from stock (~1150mv) to ~1050mv at full 1342MHz, or drop clock to a lower OC and use 960-1020mv. Depends on ASIC quality, but out of 10 Nitro cards these are what I use. Usually at 1260MHz you can drop below 1000mv unless ASIC quality is really low. Going below 1000mv you also need to drop memory voltage. My worst card ASIC quality in the 0.4 percentile runs 1050mv @ 1306 Mhz. 980mv usually safe @ 1260Mhz. I have ran semi stable down to ~940mv and 960 is often long term stable. Use GPU-Z to see actual voltage.
thank you. very good info.
One question. So if i want to maksimaze Mhash, i will go from stock MC (2000) to 2200 Mhz and i will lover GPU clock to 1250 or less (from stock 1346). how fair i can go with voltega if stock is 1150 mV?
i saw, that if i have 2200 MC and if i drop GPU clock to somewhere around 1050Mhz, i lost around 5-10 Mhash overall. but cannot confirm,that is less power hungry.
do you cheak at GPU-Z avg power? temporary i have around 150W (4 GPU),one gpu is showing 198w avg,which is a little to high. 1200 GPUC and 2200MC.
I think you can drop GPU clock without loosing Eth, but secondary coin would be slightly slower. I leave around 1260, which is default for the 470 Nitro cards. On a 470 dual mining GPU-Z shows 110-120 GPU Only power draw on a 470, or ~130-140 on a 480, depends on how low voltage is. 1000mv should be doable by most cards, I start at 1020mv and end up ~960-1000 usually. You can lower voltage more if lowering clock, someone said they can lower to 800mv @ like 900Mhz, but I haven't tested. At 1050Mhz perhaps you could try 900mv?
Eth speed is pretty much 100% dependent on memory speed, secondary coin is affected by core clock.
You can also lower power by lowering -dcri, to slow down secondary coin. LBRY uses ~10w less power, but lowers Eth speed ~2MH, it is currently less profitable. Best balance right now is ~22Mh Eth, 50Mh lbry, though sia still better.
